Toyota RAV4 manuals

Toyota Sienna Service Manual: Occupant Classification ECU Malfunction

DTC B1795 Occupant Classification ECU Malfunction

DESCRIPTION

DTC B1795 is recorded when a malfunction is detected in the occupant classification ECU.

Troubleshoot DTC B1771 first when the DTCs B1771 and B1795 are output simultaneously.

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

1 CHECK DTC

  1. Turn the ignition switch to the ON position, and wait for at least 10 seconds.
  2. Check the DTCs.

    Result:
    A: DTC B1795 is output.
    B: DTCs B1771 and B1795 are output.

HINT: Codes other than DTC B1771 and B1795 may be output at this time, but they are not related to this check.

2 CHECK FUSE

  1. Measure the resistance of the ECU-B fuse.

Resistance: Below 1 Ω

3 CHECK WIRE HARNESS (SOURCE VOLTAGE)

CHECK WIRE HARNESS (SOURCE VOLTAGE)

  1. Turn the ignition switch to the LOCK position.
  2.  Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds
  3.  Disconnect the connector from the occupant classification ECU.
  4.  Connect the negative (-) terminal cable to the battery.
  5.  Turn the ignition switch to the ON position.
  6.  Measure the voltage according to the value(s) in the table below.

Standard voltage

Standard voltage

  1. Turn the ignition switch to the LOCK position.
  2.  Measure the resistance according to the value(s) in the table below.

Standard resistance

Standard resistance

4 REPLACE OCCUPANT CLASSIFICATION ECU

  1. Turn the ignition switch to the LOCK position.
  2.  Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
  3.  Replace the occupant classification ECU

5 PERFORM ZERO POINT CALIBRATION

  1. Connect the negative (-) terminal cable to the battery.
  2. Connect the intelligent tester to the DLC3.
  3.  Turn the ignition switch to the ON position.
  4.  Using the intelligent tester, perform "Zero point calibration".

OK: "COMPLETED" is displayed.

6 PERFORM SENSITIVITY CHECK

  1. Using the intelligent tester, perform "Sensitivity check".

Standard value: 27 to 33 kg (59.52 to 72.75 lb)

END

Open in Occupant Classification ECU Battery Positive Line
DTC B1794 Open in Occupant Classification ECU Battery Positive Line DESCRIPTION This circuit consists of the occupant classification ECU and the power source circuit (battery, fuse, wire harness ...

Sleep Operation Failure of Occupant Classification ECU
DTC B1796 Sleep Operation Failure of Occupant Classification ECU DESCRIPTION During sleep mode, the occupant classification ECU reads the condition of each sensor while the ignition switch is of ...

Other materials:

Installation
1. INSTALL REAR DIFFERENTIAL SIDE GEAR SHAFT BOLT (a) Install the bolt tightening the nut through the plate washer. 2. INSTALL REAR DRIVE SHAFT ASSEMBLY LH HINT: (See page DS-26) 3. INSTALL REAR AXLE SHAFT NUT LH HINT: (See page DS-26) 4. INSTALL REAR SPEED SENSOR LH HINT: (See page D ...

Removal
1. REMOVE REAR SEAT LEG SIDE GARNISH SUBASSEMBLY LH  Disengage the clips and remove the seat leg side garnish. 2. REMOVE REAR NO. 2 SEAT ASSEMBLY LH Remove the bolt and locus cable.  Remove the 2 bolts and seat.  Remove the 2 headrests. ...

Weight limits
The gross trailer weight must never exceed 3500 lb. (1588 kg).* The gross combination weight must never exceed the GCWR described below. 2WD models: 8900 lb. (4037 kg)* AWD models: 8990 lb. (4078 kg)* The gross vehicle weight must never exceed the GVWR indicated on the Certifi ...

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